fix docstring in get_subscription_summary client function

[charcey]

Related Issue(s):

Closes #

Proposed Changes:

For inclusion in changelog (if applicable):

Not intended for changelog:

1. Updated doc string for correct doc generation

Diff of User Interface

Old behavior:

(args should be parameters and formatted to a table)
New behavior:
Args will be formatted correctly in doc generation

PR Checklist:

• This PR is as small and focused as possible
• If this PR includes proposed changes for inclusion in the changelog, the title of this PR summarizes those changes and is ready for inclusion in the Changelog.
• I have updated docstrings for function changes and docs in the 'docs' folder for user interface / behavior changes
• This PR does not break any examples or I have updated them

(Optional) @mentions for Notifications: